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Segment Reporting and Concentrations - Revenues by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 17,450	$ 14,553	$ 50,466	$ 42,946
US
Segment Reporting Information [Line Items]
Revenues	9,467	6,613	26,761	19,561
United Kingdom
Segment Reporting Information [Line Items]
Revenues	2,912	2,832	8,709	8,284
The Netherlands
Segment Reporting Information [Line Items]
Revenues	1,750	1,704	5,012	5,003
Canada
Segment Reporting Information [Line Items]
Revenues	1,469	1,434	4,556	4,304
Other - principally Europe
Segment Reporting Information [Line Items]
Revenues	$ 1,852	$ 1,970	$ 5,428	$ 5,794

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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- Definition

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+ References

No definition available.

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